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American Geological Services, Inc. installed three additional monitoring wells on March 8, 1996. <br /> Two wells were installed to further define the lateral extent of soil and ground water <br /> contamination, and one well was installed in the down gradient direction to determine the <br /> vertical extent of the ground water plume. The lateral and vertical extent of ground water <br /> ' contaminations was determined to have been defined during this last phase of investigation. <br /> ' 1.3 Geology <br /> The subsurface geology of the site was determined by logging soil samples collected at various <br /> ' intervals during the initial and supplemental site investigations performed by Remcor, and <br /> American Geological Services. The maximum depth of boring was 45 feet below grade. <br /> Remcor reported that dark brown silty clay dominates the stratigraphy from within one foot of <br /> the surface to the bottom of their borings installed to 18 feet below grade. In general, fine sand <br /> was found within the silty clay unit near the bottom of the borings. <br /> During the installation of the additional three monitoring wells, AGS encountered silty fine sands <br /> ' to a depth of approximately 20 feet. A fine to medium sand layer was found between 20 and 25 <br /> feet in MW-8, and between 25 and 35 feet, and 40 and 45 feet in MW-9. <br /> 2.0 OBJECTIVE AND SCOPE OF WORK <br /> 2.1 Objective <br /> ' The objective of this phase of the investigation is to remove gasoline contaminated soil caused <br /> by a release of gasoline from the former UST or its associated piping. This work will be <br /> ' conducted in accordance with Section 2772(a) of the California Underground Storage Tank <br /> Regulations (Title 23, Division 3, Chapter 16 California Code of Regulations). In order to <br /> accomplish the above-stated objective, the following scope of work is proposed. <br /> 2.2 Scope of Work <br /> ' Task I -Planning and Permits . <br /> ' • Prepare and submit this project work plan to the San Joaquin County Public Health Services, <br /> Environmental Health Division (PHSIEHD) and the California Regional Water Quality <br /> Control Board (CRWQCB). <br /> . Prepare and submit a site specific Health and Safety Plan (HASP) to the PHSIEHD and the <br /> CRWQCB. <br /> • Obtain appropriate permits. <br /> r <br /> American Geological Services, Inc. <br /> CA95DE-029 <br /> 4 <br />